1 definition
by
The Good Friar

Verb:
1. To feel the cosmic energy, to draw knowledge from any energy source, be it a person, a tree, or light.
Easiest while under the effects of entheogens, although Ganja has been known to help.
2. To do something to one's fullest capacity.
3. To have one's third-eyed opened.
Comes from the word Grok, meaning to understand so thoroughly that the observer becomes a part of the observed, from Robert A. Heinlein's 1961 book, "Stranger in a Strange Land."